Re: Security by obscurity?
Yes it does.
Do you know the location of the various US fleets ? China and Russia may know of one or two, but they don't know all the them. Those they do not know are secure.
Do you know the location of CIA safehouses in the world ? Neither does anyone else. They are secure, until the CIA thinks they're not and decommission them to create one somewhere else.
Security through obscurity works very well, just not on the Internet. At least, not if the target is interesting enough. I totally agree with the idea that the Itanium is not interesting for hackers.
That, plus the fact that the Stock Exchange is the most watched, audited and controlled place in the world - due to the overpowering flow of money - means that any hacking attempt will likely be flagged, traced and blocked faster than you can blink. On top of that, police authorities will treat it as a red alert priority one, putting every relevant asset on the case.
No, neither Russia nor China would be daft enough to mount an attack against any Stock Exchange, and no mere lone blackhat would dare try. So the fact that they're running Itanium is actually a very secondary concern.